[quote=Edchris177]Those 4 1/2" angle grinders can be had for $20 & work very well. Make sure you use a grinding disc, not a cutting disc. Also, hold the tool so the disc is parallel with the surface to be ground. This gives pretty fine control over the removal of material. If you hold it 90* it is very difficult to achieve a smooth finish.
For large/long areas, such as the entire keel, I would use a sander, they give better results on large fairly flat areas.
Don't get to hung up on the grit #, you can accomplish the same thing with 400, it will just take a long time. Something like 60 grit is pretty coarse, & allows quick removal of material, at the cost of leaving coarse sanding marks. You don't really care about initial sanding marks, as the resin will fill them in.[/quote]
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